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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) [2017-2021] Payara Foundation and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://github.com/payara/Payara/blob/main/LICENSE.txt
 * See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at legal/OPEN-SOURCE-LICENSE.txt.
 *
 * GPL Classpath Exception:
 * The Payara Foundation designates this particular file as subject to the "Classpath"
 * exception as provided by the Payara Foundation in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
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 * If you wish your version of this file to be governed by only the CDDL or
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 * recipient has the option to distribute your version of this file under
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package fish.payara.microprofile.jwtauth;

import static java.util.logging.Level.FINEST;
import static java.util.logging.Level.INFO;

import java.util.Set;
import java.util.logging.Logger;

import jakarta.enterprise.inject.Instance;
import jakarta.enterprise.inject.spi.CDI;
import jakarta.servlet.ServletContext;
import jakarta.servlet.ServletContextEvent;
import jakarta.servlet.ServletContextListener;

import fish.payara.microprofile.jwtauth.cdi.JwtAuthCdiExtension;

/**
 * This servlet container initializer checks if CDI is active and if so obtains
 * the JWT CDI extension to fetch the collected roles from, which are then declared to the
 * Servlet container.
 * 
 *  <p>
 *  Declaring roles is a requirement of Java EE and Payara specifically enforces this. I.e. roles
 *  that aren't declared don't work.
 * 
 * @author Arjan Tijms
 */
public class RolesDeclarationInitializer implements ServletContextListener {
    
    private static final Logger logger =  Logger.getLogger(RolesDeclarationInitializer.class.getName());

    @Override
    public void contextInitialized(ServletContextEvent sce) {
        final ServletContext ctx = sce.getServletContext();
        
        Set<String> roles = null;
        boolean addJWTAuthenticationMechanism = false;
        
        try {
            CDI<Object> cdi = CDI.current();
            
            if (cdi != null) {
                Instance<JwtAuthCdiExtension> extensionInstance = cdi.select(JwtAuthCdiExtension.class);
                
                if (extensionInstance != null && !extensionInstance.isUnsatisfied() && !extensionInstance.isAmbiguous()) {
                    JwtAuthCdiExtension cdiExtension = extensionInstance.get();
                    
                    if (cdiExtension != null) {
                        roles = cdiExtension.getRoles();
                        addJWTAuthenticationMechanism = cdiExtension.isAddJWTAuthenticationMechanism();
                    }
                }
            }
        } catch (Exception e) {
            logger.log(FINEST, "Exception trying to use CDI:", e);
        }
        
        if (roles == null) {
            logger.log(FINEST, "CDI not available for context " +  ctx.getContextPath());
            return;
        }
        
        if (!addJWTAuthenticationMechanism) {
            return; // JWT authentication mechanism not installed, don't process the roles for Payara 4
        }
        
        if (logger.isLoggable(INFO)) {
            String version = getClass().getPackage().getImplementationVersion();
            logger.log(INFO, "Initializing MP-JWT {0} for context ''{1}''", new Object[]{version, ctx.getContextPath()});
        }
        
        ctx.declareRoles(roles.toArray(new String[0]));
    }

}
